(Reuters) – Former “Batman” star Michael Keaton gave a soaring start to the on Wednesday as a crestfallen superhero in “Birdman”, a film its Mexican director Alexandro Inarritu called an experiment that could have failed miserably. The film brings starpower that Venice, the world’s oldest film festival, needs to keep itself from being sidelined by the celebrity magnet of Cannes in May and industry powerfest the Toronto Film Festival, which opens next week. Noted for […]